You can drag the yellow sponge under the Item Bubble to create a platform to leap off of. You can perform a similar maneuver with the wheeled cart in the next area. When you come to the Item Bubble on top of the stack of blocks, jump up and then grab the stack in the middle. Hold the stack and press the analog stick in a direction away from the stack to take advantage of its center of gravity and pull it down. Item Bubble: The Sofa Ramp Item Bubbles: Beneath the Sofa Ramp Item Bubbles: The Path Below the Key The Key Item Bubble: Behind the Books Tip: The Level Link Tip: Hidden Switch Hint: The Race